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            To make your project more structured, group files into clusters by using the file nesting rules.
            For example, you can make all <span class="code">_test</span> files children of main
            files.
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        <p>To define a rule, click the <span class="control">Show Options Menu</span> icon in the
            <span class="control">Project</span> tool window, select <span class="control">File Nesting</span>,
            and type a rule in <span class="control">Child file suffix</span> field.
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                <img src="images/go_file_nesting_rules.png" alt="">
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